import uuid

class UUIDMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response
    def __call__(self, request):
        response = self.get_response(request)
        try:
            request.COOKIES.get('uuid')
        except KeyError:
            response.set_cookie('uuid', uuid.uuid4().hex,max_age= 60*60)
        return response